Means for controlling the stroke of fluid-operated pistons.



PATENTED JULY'ZL, 1908.

ELUD OPERATED PISTONS.

APPLICATION FILED DEC.11,1LO7.

2 SHEETS-SHEET l.

PTENTED JULY 14, 1908.

No. 893.398A

y J. W. SMITH. Ns POMQNTROLLING THE STROKE 0F mum OPERATED PISTONS.'

MEA

APPLICATION FILED DEC.11,1907.

vticuler to `provii JOSEPH W. SMT, OF PORTLAND, OREGON.

MEANS son ooN'rsoLLNG 'rm No. soeces.

Specification of Letters Patent.

STROKE 'QF FLUIE-OPERATED PXSTN'E.

retained .my 1e, ieee.

Original application filed February 23, 1906, Serial No. 302,1183.Biviiie and thisepplicaton Bled .December 11,

' 1997. Serial. No. 12106,'070.

To (1Mo/hom it muy concern.'

Be it known that I, Josnrn W.;Si.nfrn, of Portland, in the county oiit'iultnonnih and in the Stute of Gregori, have invented e certain newond useful improvement in Meeus for Controlling the Stroke of Fluid-0)eretcd Pistons; end i do herehy dechire tiret the 'following is e full,clem', and exact description` thereof, reference being hed to the nc-Ycon iloonyincT drawing, in which?- Figurc 1 is o plain view of unembodiment cf my invention adopted for sewing mnchinc; Fig. 2 e sideelevation of the same; Fig. 3 a pla-n view of the cylinder end valvemechanism on on enlarged scale, partly' in horizontal section; Fig. e :ivertical sectionl on the line l--i of Fig. 1; Fig. 5 u detail View on enenlarged scale of one oi thestrokeadjusting devices; and, Fig. 6 elongitudinal Isection in detail of one ci' the veives.

- The object of my invention, hromllystutcd, is to provide moons forvarying the stroke ot luid-prcssure-o ieruted pistons, und in perle evalve mechanism for this purpose, whose operation will bequicl, undtosuch ends, my invention consists in the mechanism constructedsubstantially os hereinafter speciiied and claimed.

For the puriliose of' illustrating my invention, I have ected onembodiment thereof for operating e sew, hut though i select this itsillustratingT an embodiment of the invention, it is to he understoodthut the invention is applicable to stecrn or pneumatic henuncrs,riveters, driils, or any piston-operated meehine, in which adjustment orvariation ot' stroke, or quick cut-oit` is `desired. in the instanceshown, the -engine is a. doubleecting one, the cylinder 1' hsving eteach end o vulve controlled port 2 and o piston 3, l'utvinfJr its rod 4connected to s cross-heed 5 sliduble on parallel guide rods 6, and tothe cross-heed 5 as'eW 7 being etteched et one end. ln the valve chest8, et eech end of the cylinder, is e hollow piston valve 9, and

the'two Valves 9 are connected by a rod 10 which passes through c pipe 11 that connects the two valve chests, end into which coinvpressed oirnor other fluid under 'pressure is supplied by ineens of c pi e 12 havingc hond operated vulve 13. Lee ing'irom the outer end of each valve chestin en olf-set or extension le thereof, is a. port 15, end connecting thetwo chest extensions 1e is e tube or pipe 16 thet extends parallel withthe cylinder, in which pipe or tuhc is e closely itting plunger orpiston 17, from one end of which extends e piston rod 18 that possesoutward through suitable stuffing box to on armen the cross-.heed 5, towhich it is bolted, that the piston 17 will reciprocste with the piston3 in the cylinder 1. When the pistou l? moves in one direction, the airin the tube 16 in advance ot' it will he com ressed, and pessing,rthrough the port 15 wil oct upon the piston valve 9 :it that end of thecylinder towards which the piston 17 is moving, and subjecting seidpiston thereof' to the required pressure will sluit the seine, and whenthe piston 17 moves in the o posits direction, it will vproduce a.similar eiiect upon the other piston. `valve 9, hut in the oppositedirection. `When 'u valve S) reaches the limit oi its movement, underpressure from. the piston 17, eir exhausts or escepes to the atmospherethrough o port 81 in the valve chest.

.it will be seen that, by varying; the volume or quantity of the oirbetween each volvo 9 end the piston 17, the ioint or cut-oil' may hevuried, or the strole of the operating piston l may be lengthened orshortened. To very the volume of the nir het weon the piston 17 end thevelves-Q, l provide et suitable intervals along the tube 16 e series ot'ports 19, erich lendingr to n threaded nipple 20, on which is screwed sccp 2)'. having' holes or pcrloretions 22 in its sides which', by theproper turning of the csp, may he pleced into or out ot' connnunicstionwith the interior of the nipple, sind so with thc interior of the tubeor pipe 18, vend piece the letter in communication with the externel airthroughsJ particular port, or cut-oit' such communication with. theexternal air, either partially or Wholly. lt will be seen that, byIneens of the adjustment of the caps '21, which may Wholly or pitrtioliyclose their respective ports, the volume of air in the tube 16 inadvance of its piston may he varied, and thus the time of operation ofthe piston valves controlled to suit the point of cut-oil' or length yofstroke of the operating piston 3 that is desired.

.it will be seen that the mechanism for ccrrying my invention intopractice is not only extremely simple, but it is thoroughiy efficientand the operetion of the piston valves quick.

2 l see,ees

` The subject-matter of this applicetion is a division of my applicationNo. 302,483, filed Feb'. 23, 1906. r

' Having thus described my invention, what 5 I claim isff 1. Thecombination of a. Working piston, e iluidpressure-operated valve forcontrolling the supply of iluid under pressure to such piston, a pistonfor operating seid valve, and

means for Varying the Volume of fluid between said piston and seidvalve.

2. The combination of a Working piston, i iiuid-pressure o erated valvefor controlling the supply of uid under pressure to such piston, apiston for operating said valve,

means foryarying the volume of fluid between seid piston and seid valve,and connections between said piston and the Working piston.

l 3. The combination of a Workingpiston, a

luid-pressure-operated valve for controlling the supply of fluid underpressure to such piston, e piston for operating seid valve, and

s. cylinder for seid iston having e series of outlets adapted to eopened and closed.

4. The combination of e. Working piston,

a cylinder therefor, a iuidfpressure-operated ,valve for controlling theadmission of fluid JOSEPH W, SMITH.

Witnesses:

TRUMAN J. GLOVER, LESTER L. CURL.

